Usually lighter skinned than stereotypical Mexicans. They drive Ferraris, Bentleys, Maseratis, etc. They wear Bijan, Brioni, Gucci, Prada, Louis Vuitton, etc. They control one of the world's biggest economies and keep getting richer and richer as their country does so too.
John: How do you find the richest person in Mexico?
Kyle: You throw a penny on the ground and whoever gets it.
Alex: Actually, the richest person in the world is Mexican.
Kyle: Really? Haha, didn't know that.
Alex: I'm Mexican too.
John: No way! You look so White.
Alex: Yeah, I am White and Mexican, and I actually pay full tuition, unlike you two. I'm one of millions of Rich Mexicans.
A rare breed here in the United States. More than likely his/her daddy owns a successful business such as construction, a restaurant, or a store. They tend to have many cars, balancing between blacks and whites. Black have nice rims on shitty cars and whites have shitty stock rims on nice cars. Rich Mexicans will have nice rims on nice cars. They usually wear Abercrombie & Fitch, Polo Ralph Lauren, and Lacoste. They are usually very good looking.
White boy: "Damn, look at that rich Mexican in that nice truck."
White girl: "Well, of course. His dad owns a successful business and they are doing quite well."
Other oxymorons include: friendly blacks, sober Irishmen, Dumb Asians, poor Whites, straight faggots, Capitalist Communists, and Puerto Ricans who aren't dirty brown cigar rolling assclowns, and the list goes on.
Acknowledging the existence of a rich Mexican is the same as dividing by zero.